main {
  background: #fff;
}
.sitenav {
  padding: 0 50px;
}
.sitenav li {
  height: 30px;
  line-height: 30px;
  background: #f1f1f1;
  border: 1px solid #ccc;
  float: left;
  padding: 0 5px;
  margin: 5px;
  position: relative;
}
.sitenav li a {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}
.sitenav li img {
  width: 16px;
  height: 16px;
}
